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Bridge Software

Bridge Software A bridge connects networks and forwards frames from one network to another. PORTS A B E F BRIDGE C D G H A B E F BRIDGE C D G H Selective Forwarding If A sends a frame to E - the frame must be forwarded by the bridge.

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Bridge Software

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  1. Bridge Software • A bridge connects networks and forwards frames from one network to another. PORTS A B E F BRIDGE C D G H

  2. A B E F BRIDGE C D G H Selective Forwarding • If A sends a frame to E - the frame must be forwarded by the bridge. • If A sends a frame to B - there is no reason to forward the frame.

  3. Bridge Database • The bridge needs a database that contains information about which hosts are on which network. • The realistic options are: • The system administrator can create and maintain the database. • The bridge can acquire the database on the fly. Hard to add new computers Some loss of efficiency

  4. Learning the host mapping • The bridge forwards packets for which it does not know which network the destination is on. • Everytime the bridge forwards a packet it can record the network on which the sender is located. • Each host mapping expires when it is unused for a “long” period of time.

  5. Learning Bridge • A host can be moved to another network. • New hosts can be added at any time. • Requires no setup information from humans. • One MAJOR flaw:

  6. What is the problem ? Bridge 1 0 1 D A E B F C Bridge 2 0 1

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